One of the key parameters influencing sprinkler irrigation performance is water quality. In this study, the spatial variability of groundwater quality parameters (EC, SAR, Na ? , Cl -, HCO 3 -and pH) was investigated by geostatistical methods and the most suitable areas for implementation of sprinkler irrigation systems in terms of water quality are determined. The study was performed in Fasa county of Fars province using 91 water samples. Results indicated that all parameters are moderately to strongly spatially correlated over the study area. The spatial distribution of pH and HCO 3 -was mapped using ordinary kriging. The probability of concentrations of EC, SAR, Na ? and Cl -exceeding a threshold limit in groundwater was obtained using indicator kriging (IK). The experimental indicator semivariograms were often fitted well by a spherical model for SAR, EC, Na ? and Cl -. For HCO 3 -and pH, an exponential model was fitted to the experimental semivariograms. Probability maps showed that the risk of EC, SAR, Na ? and Cl -exceeding the given critical threshold is higher in lower half of the study area. The most proper agricultural lands for sprinkler irrigation implementation were identified by evaluating all probability maps. The suitable areas for sprinkler irrigation design were determined to be 25,240 hectares, which is about 34 percent of total agricultural lands and are located in northern and eastern parts. Overall the results of this study showed that IK is an appropriate approach for risk assessment of groundwater pollution, which is useful for a proper groundwater resources management.

This paper investigates the behaviour of current velocity and salinity in tidal channel network, particularly in tidal junction. Acoustic tomography method and numerical model were applied to analyse flow field pattern in tidal junction between Tenma river and Kyu Ota river. The velocity patterns by numerical model and FATS were in a satisfactory result with reference data by ADCPs. Interplay between tidal action and geometrical shape of the channel network can cause change of current velocity pattern in the tidal junction. It is found that the ratio of current velocities in the tidal junction between Kyu Ota river and Tenma river is ± 62%. Behaviour of salinity pattern in Kyu Ota and Tenma river during neap and spring tide indicates that salinity during neap tide is greater than that during spring tide. However, there is no significant difference of salinity pattern between Kyu Ota and Tenma river in tidal junction.